I've always had luck stopping bucks with a deep "Bahp". In fact, I use the deep "Bahp" after the shot too. Sometimes they stop after the shot to that sound and that's enough for them to then drop right down.
Of course, sometimes there is nothing you can do to stop a deer or any animal for that matter. I once tried to stop a beautiful red fox that went by me at 30 yards during gun season. I couldn't get him to stop for a shot, I made every sound in the book and even stood up and yelled to avail. (I hunt from the ground).